JP2002153819A - Vibration generator for small radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vibration generator for a small radio equipment in which manufacturing of a vibration element is made easy, the element is coupled to the rotary shaft of a motor with high pull out strength by a small calking force and the size of the entire device is further reduced. SOLUTION: In a vibration generator for a small radio equipment in which a vibrating element 10 is integrally coupled to a rotary shaft 12 of a motor, a groove section 13 is formed on the element 10 so that the shaft 12 is engaged into an eccentric loading section 11. Wall sections 14 are oppositely formed so as to form both side walls for the section 13. Among the tip section end faces of the section 14, portions 14b of the groove section side retaining outer peripheral side portions 14a and the portions toward at least one tip section 14e along the shaft line direction of the shaft 12 are calked toward a bottom side from the opening side of the section 13. Thus, the element 10 is integrally coupled to the shaft 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator used for calling a small wireless device such as a portable telephone.

[0002]

2. Description of the Related Art In recent years, as a kind of a small wireless device such as a paging type small wireless calling device, a PHS or a portable telephone, a vibration made by eccentrically connecting a vibrator made of a high specific gravity metal to a rotating shaft of a motor. Those with a built-in generator are becoming widespread. According to a small wireless calling device or the like incorporating such a vibration generating device, instead of generating a ringing sound, vibration is generated by the rotation of the vibrator. The reception can be confirmed without being known.

Conventionally, a vibration generator for a small radio device of this type has a non-cylindrical vibrator integrally connected to a rotating shaft of a small motor connected to a signal generation circuit of the small radio device. Configuration. Here, this vibrator is made of a metal having a high specific gravity formed by a powder metallurgy method, and a cylindrical boss portion is integrally formed on an eccentric load portion having a substantially fan-shaped cross section, and formed on the boss portion. The rotating shaft is inserted into the mounting hole, and the boss portion is crimped and plastically deformed, so that the boss portion and the rotating shaft are tightly connected to each other and integrally connected to the rotating shaft.

According to the above-described conventional vibration generating device, the vibrator itself is caulked and directly connected to the rotating shaft. Therefore, the vibrator is connected to the vibrator via an adhesive or other connecting parts. There is an advantage in that the number of parts can be reduced as compared with the case where the is fixed to the rotating shaft.

[0005]

However, in the above-described conventional vibration generator, since a mounting hole must be formed inside the cylindrical boss of the vibrator, the powder raw material is pressed. When the vibrator is formed by using the method, it is difficult to fill the powder material into the forming die portion of the boss portion, in which the outer periphery becomes thin in particular, and there is a problem that the yield of the vibrator is reduced. Also, due to recent demands for miniaturization, when trying to form the vibrator itself to have a small diameter, the boss around the mounting hole becomes extremely thin, so that it is easy for cracks to occur when swaged with a large force. If the crimping force is small, a desired pull-out strength cannot be obtained, and there is also a problem that adjustment of the crimping force becomes difficult.

Therefore, as another conventional vibration generator,
As shown in FIGS. 9 and 10, a groove 4 into which the rotating shaft 3 is fitted is formed in the center of the eccentric load 2 of the vibrator 1.
Further, the wall portions 5 serving as both side edges of the groove portion 4 are integrally formed by swelling from the eccentric load portion 2 along the groove portion 4, and the central portion in the axial direction at the front end portion of the wall portion 5 is moved to the front end. Has been proposed that is integrally connected to the rotating shaft 3 by caulking from the opening side of the groove portion 4 to the bottom side by a caulking punch 7 formed in an R shape or a rectangular parallelepiped shape.

According to the above-described conventional vibration generator, molding is easier than a vibrator having a boss having a mounting hole, thereby improving the manufacturing yield, and the vibrator 1 itself has a small diameter. Even if it becomes
As compared with the case where a thin portion such as the outer peripheral portion of the boss portion is crimped, there is an advantage that a crack is less likely to occur.

However, in the conventional vibration generator shown in FIGS. 9 and 10, when crimping the end face of the front end of the wall 5, the entire width dimension from the groove 4 side to the outer periphery 6 side is crushed. In spite of the necessity of a large caulking force, the rigidity of the portion of the wall 5 on the groove 4 side is increased by the rotating shaft 3, so that the portion is exclusively a free end when plastically deformed. As a result, there is a problem that a high pull-out strength cannot be obtained as a result.
In addition, as a result of requiring a large caulking force, even if the vibrator 1 is made small in diameter, an attempt to increase the tungsten content in order to obtain a desired vibration becomes more brittle in material, so that the caulking wall is required. There is also a problem that cracks are easily generated in the portion 5.

Further, since the central portion in the axial direction at the distal end portion of the wall portion 5 is caulked by the caulking punch 7, the length between the axial end faces is reduced with the downsizing of the vibrator 1. Becomes smaller, sufficient pull-out strength cannot be obtained, and it is necessary to prepare separate caulking punches 7 having different caulking lengths for the vibrators 1 having different lengths in the axial direction. However, there is also a problem that economic efficiency is poor.

The present invention has been made in view of the above circumstances, and makes it possible to easily manufacture a vibrator and to connect the vibrator to a rotating shaft of a motor with high pull-out strength even with a small crimping force. Accordingly, it is an object of the present invention to provide a vibration generator for a small wireless device that can further reduce the size of the entire device.

[0011]

According to a first aspect of the present invention, there is provided a vibration generating apparatus for a small wireless device, wherein a vibrator is integrally connected to a rotating shaft of a motor.
In the vibrator, a groove is formed in which the rotating shaft is fitted into the eccentric load portion, and walls forming both side walls of the groove are formed to face each other, and the outer peripheral side of the end surfaces of the distal end portions of these walls is formed. The part on the groove side leaving the part, and the part reaching at least one end in the axial direction of the rotating shaft,
By being swaged from the opening side to the bottom side of the groove, the groove is integrally connected to the rotating shaft.

According to a second aspect of the present invention, in the first aspect of the present invention, the end face of the front end of the wall portion is left in the axial direction of the rotating shaft with the end face on the motor side. And the other end surface is swaged to be integrally connected to the rotating shaft.

[0013] The invention according to claim 3 is based on claim 1.
In the invention described in (2), in the width dimension W from the groove side to the outer peripheral side of the end face of the front end portion, a range of 0.25 W to 0.9 W from the edge on the groove side is crimped. It is assumed that.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the groove of the vibrator is formed to have a size having a range of a central angle of 180 ° or more of the rotating shaft. And the ratio (W ₁ / D) of the opening width W _{1 of the} groove to the diameter D of the rotating shaft of the motor is 0.5.
It is characterized in that it is set to be in the range of 0 to 0.95.

In the vibration generator for a small wireless device according to any one of the first to fourth aspects, the rotating shaft of the motor is fitted into the groove, and the end face of the end portion of the wall forming both side edges of the groove is formed. Of these, the portion on the groove side except the outer peripheral side portion is swaged toward the bottom side of the groove, so that the vibration is generated by a smaller swaging force as compared with the conventional vibration generator shown in FIGS. 9 and 10. It becomes possible to couple the child to the rotating shaft. At this time, the outer peripheral portion of the unswaged wall portion acts as a wall portion against plastic deformation at the swaged portion, and as a result, most of the swaged portion bulges toward the groove.
Then, the vibrator is firmly fixed to the rotating shaft by the three points of the rotating shaft at the bottom of the groove portion and the two bulging wall portions. For this reason, according to the vibration generator according to the present invention,
In addition to being easy to manufacture the vibrator, the vibrator can be coupled to the rotating shaft of the motor with a high pull-out strength even with a smaller crimping force.

In addition, by crimping a portion of the end surface of the front end portion of the wall portion on the groove side except for the outer peripheral portion and reaching at least one end in the axial direction of the rotating shaft. Since the vibrator is coupled to the rotating shaft, sufficient pull-out strength can be obtained even when the length between the end faces in the axial direction is reduced due to the downsizing of the vibrator. Moreover, if a caulking punch having a size larger than the axial length of the vibrator is prepared, a plurality of types of vibrators having different lengths can be caulked using one caulking punch. Work can be done.

As described above, according to the vibration generator according to any one of the first to fourth aspects of the present invention, the vibrator is firmly fixed to the rotating shaft of the motor by a caulking force smaller than that of the related art. Therefore, the size and weight of the vibrator can be reduced, and the size and weight of the entire vibration generator and the size of the small wireless device can be reduced. In addition, as a result of reducing the crimping load and preventing the occurrence of cracks in the vibrator, the productivity of the vibration generator can be improved, and the vibration efficiency can be improved by increasing the specific gravity of the vibrator. Further, since a plurality of types of vibrators can be caulked by one caulking punch, the economy is also excellent.

Here, when caulking the end face of the tip of the wall, particularly when the length of the vibrator in the axial direction is small, caulking is performed so as to extend between both end faces in the axial direction of the wall. However, in such a small vibration generator, since the distance between the vibrator and the motor is generally small, the space between the vibrator and the end face on the motor side is left as in the invention described in claim 2. If you crimp the part up to the other end,
It is possible to prevent the swaged wall portion from expanding and interfering with the motor.

According to the first or second aspect of the present invention, when the groove-side portion of the end surface of the wall portion except the outer peripheral portion is swaged toward the bottom of the groove,
As in the invention according to claim 3, it is preferable to crimp a range of 0.25 W to 0.9 W from the groove side edge of the width dimension W from the groove side to the outer peripheral side of the front end face. .
At this time, if the crimping width is small, the axial crimping length may be increased. Conversely, if the crimping width is large, the axial crimping length may be increased. Even if small, sufficient pull-out strength can be obtained. The crimping range is limited to the range of 0.25 W to 0.9 W. If the range is smaller than 0.25 W, a sufficient amount of plastic deformation for firmly fixing the vibrator to the rotating shaft of the motor is obtained. Conversely, if the above range exceeds 0.9 W, the action of the above-mentioned wall portion against plastic deformation of the caulked portion decreases, and as a result, the outer peripheral portion is also forced to deform outward, and the pull-out strength is increased. This leads to a decrease in

The wall may be formed so that the groove is entirely U-shaped by making the wall stand upright from both side edges of the groove. In this case,
When the rotating shaft is fitted in the groove, the rotating shaft is provided in the groove within a central angle of 180 °. On the other hand, as in the invention as set forth in claim 4, the groove portion of the vibrator is formed to have a size including a range of a central angle of 180 ° or more of the rotation shaft and an opening width W of the groove portion.
₁ and the ratio (W ₁ / D) to the diameter D of the rotating shaft is 0.5
When the vibrator is set to be in the range of 0 to 0.95, the vibrator can be firmly fixed by more effectively closing the opening of the groove by plastic deformation of the wall after swaging. It is suitable.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 3
Indicates a first embodiment of the present invention, and reference numeral 1 in FIG.
0 is a vibrator. The vibrator 10 is made of a metal having a high specific gravity formed by powder metallurgy and has a semicircular cross section centered on the axis O, and the entire semicircular portion eccentric from the axis O has an eccentric load. The section 11. The vibrator 10 has a groove 13 formed at the center of the outer circumferential arc of the eccentric load portion 11. On both sides of the groove 13, the vibrator 10 swells in parallel from the eccentric load portion 11 and has both side walls of the groove 13. Is formed integrally. Here, the groove 13 has a bottom portion into which the rotating shaft 12 of the motor fits is formed in a semicircular shape substantially equal to the diameter of the rotating shaft 12, and the rotation of the motor in which the vicinity of the opening is fitted into the groove portion 13. It is integrally formed so as to cover the exposed portion of the shaft 12 from both sides in the direction of the axis O at intervals.

As a result, the groove portion 13 of the vibrator 10 is formed to have a size in which the central angle of the rotating shaft 12 is not less than 180 °. Then, (the dimensions of the portion shown by W ₁ in FIG. 4 before caulking) the opening width of the groove 13 between the wall portion 14 facing, the ratio between the diameter D of the rotary shaft 12 (W ₁ /
D) is set in the range of 0.50 to 0.95. To show a specific example of such a range, the diameter D (mm) of the rotating shaft 12 is 0.4, 0.5,
In the case of 0.6, 0.7, 0.8, 0.9, 1.0, the opening width W ₁ (mm) of the groove 13 between the walls 14
Of 0.3, 0.4, 0.5, 0.6, 0.7, 0.
It may be set to 8, 0.9.

In the vibrator 10, a portion 14b of the end portion of the end portion of the wall portion 14 on the side of the groove portion 13 excluding the outer peripheral side portion 14a extends over the entire length between both end surfaces 14d and 14e in the axial direction. By being caulked from the opening side to the bottom side of the groove 13 by the caulking punch 15, it is integrally connected to the rotating shaft 12. Here, the caulking punch 15 has a long side dimension in the axial direction described above.
It is formed larger than the length dimension between the end surfaces 14d and 14e. Further, the portion 14 on the groove portion 13 side to be crimped
b is 0.25 W to 0.9 W from the edge on the groove 13 side in the width from the groove 13 side to the outer peripheral side of the end face of the tip end (the dimension of the portion indicated by W in FIG. 4 before crimping). It is set to be within the range.

Incidentally, as the rotating shaft 12, for example,
Stainless steel such as SUS420 can be used. Further, the vibrator 10 is made of, for example, a W—Ni-based
-Ni-Fe system, W-Ni-Cu system, or W-Mo
It is formed by a powder metallurgy method using a superpolymerized gold material having a specific gravity of about 17 to 19 g / cm ³ , such as a Ni—Fe system. As a specific example, a mixed powder having a composition consisting of W powder; 89 to 98% by weight and Ni powder; 1.0 to 11% by weight, or W powder and N in the above-mentioned weight% range.
0.1 to 6% by weight of Cu, Fe powder;
-6% by weight, Mo powder; 0.1-6% by weight, and Co
Powder; a mixed powder having a composition containing one or more of 0.1 to 5% by weight of 1 ton / cm ^{2 to 20} ton /
compacting the fan plate in cm ^2, the green compact 0 ° C. ~-6
Liquid phase sintering in a hydrogen gas stream with a dew point of 700 ° C. or in an ammonia decomposition gas, and then in a vacuum, neutral or reducing atmosphere at 700 ° C. to 1430 ° C. ± 30 ° C.
After heating in a temperature range of ° C., a heat treatment of rapidly cooling to at least 300 ° C. at a cooling rate of 40 ° C./min or more is performed.

In such a composition of the oscillator 10, W
When the content of (tungsten) exceeds 98% by weight, the malleability is lowered but the specific gravity is increased. When the content is less than 89% by weight, the specific gravity cannot be obtained, which is inconvenient for this type of vibrator. Become. Also, when the content of Ni (nickel) exceeds 11% by weight, a predetermined specific gravity cannot be obtained, and when the content is less than 1.0% by weight, sinterability does not progress. Further, although Co (cobalt) has the same effect as Ni,
If the amount is less than 5% by weight, a sufficient effect cannot be obtained. On the other hand, if it exceeds 5% by weight, a corresponding effect cannot be obtained and the production becomes uneconomical. Although the sintering temperature of the Cu powder and the Fe powder can be lowered by containing them, the specific gravity cannot be obtained at the above upper limit.

According to the vibration generating apparatus for a small wireless device having the above-described configuration, the rotary shaft 12 of the motor is fitted into the groove 13, and of the end face of the tip end of the wall 14 forming both side walls of the groove 13. The portion 14b in the range of 0.25W to 0.9W from the edge on the groove 13 side in the width W from the groove portion 13 side to the outer peripheral side with the axis O
The entire length in the direction is caulked toward the bottom side of the groove portion 13 by the caulking punch 15 having a longer dimension than that of the conventional vibrating device shown in FIGS. 9 and 10. The vibrator can be connected to the rotating shaft by a small caulking force.

At this time, since the outer peripheral portion 14a of the wall portion 14 which is not caulked acts as a wall portion against plastic deformation in the caulked portion 14b, most of the caulked portion 14b is directed toward the groove 13 side. As a result, the vibrator 10 can be firmly fixed to the rotating shaft 12 by three points of the rotating shaft 12 at the bottom of the groove 13 and the two bulging wall portions 14.
For this reason, in addition to being easy to manufacture the vibrator 10, the vibrator can be coupled to the rotating shaft of the motor with a high pull-out strength even with a smaller caulking force.

In particular, in the vibrator 10, the groove 13
Is formed so as to include a range having a central angle of 180 ° or more of the rotating shaft 12, and the ratio (W ₁ / D) of the opening width W ₁ of the groove portion 13 to the diameter D of the rotating shaft 12 is 0.1 mm. 50-0.9
5, the vibrator 10 can be firmly fixed to the rotating shaft 12 with a small caulking force.

Further, since the end face of the distal end of the wall portion 14 is swaged over the entire length between both end faces 14d and 14e in the axial direction, the length between the end faces in the axial direction is reduced as the vibrator 10 is downsized. Even when the size is reduced, sufficient pull-out strength can be obtained. In addition, by using a crimping punch 15 having a length larger than the length of the vibrator 10 in the direction of the axis O, a plurality of types of vibrators having different lengths can be formed by one crimping punch 15. Caulking work can be performed.

Thus, according to the vibration generator,
The vibrator 10 is firmly secured by a caulking force smaller than before.
Can be fixed to the rotating shaft 12, the vibrator 10
And the overall size and weight of the vibration generator and the small wireless device can be reduced. In addition, since the caulking load can be reduced and the occurrence of cracks in the vibrator 10, particularly in the wall portion 14, can be prevented, the productivity of the vibration generator can be improved, and the vibration efficiency can be improved by increasing the specific gravity of the vibrator 10. Can be improved. Further, since a plurality of types of vibrators 1 can be caulked by one caulking punch 15, the economy is excellent.

In the first embodiment, the vibrator 10 has a configuration in which the eccentric load portion 11 is formed in a semicircular shape centered on the axis O. However, the present invention is not limited to this. For example, as shown in FIG. 4, the vibrator 16 formed in a sectoral cross section with the axis as the center, or as shown in FIG.
It has a sector shape of less than 0 ° (90 ° in the figure) and is formed in a truncated sector shape with a central section removed, thereby forming a flat surface (end surface of the end portion of the wall portion) 18 on the rotation center side. In addition, the present invention can be similarly applied to a vibrator 19 in which a U-shaped groove 17a in which the rotation shaft is fitted is formed in the center of the flat portion 18.

In the above-described first embodiment, the bottom of the groove 13 into which the rotating shaft 12 of the motor is fitted is formed in a semicircular shape substantially equal to the diameter of the rotating shaft 12, and the vicinity of the opening is formed. The exposed portion of the rotating shaft 12 is defined by an axis O
The groove 1 is formed so as to cover the rotation shaft 12 at a central angle of 180 ° or more by being formed so as to cover at intervals from both sides in the direction.
Various modifications can be applied to the shape 3.

FIG. 6 shows a modified example of the shape of the groove portion 13. The groove portion 20 shown in FIG. 6 (a) is formed by a pair of V-shaped wall surfaces 20a whose portions into which the rotary shaft 12 fits face each other. A bulging portion 20c is formed integrally near the opening 20b so as to cover the exposed portion of the rotary shaft 12 at intervals from both sides in the axial direction. The groove 21 shown in FIG.
It is formed in a substantially square shape as a whole by a side wall 21b perpendicular to the bottom surface 21a and a bulging portion 20d near the opening 21c. Further, the groove 22 shown in FIG.
Is formed by an arc-shaped wall surface 22a having a curvature substantially equal to the diameter of the rotating shaft 12 between the upper part of the side wall 21b of the groove 21 shown in FIG. 6B and the lower surface of the bulging part 21d. The groove 23 shown in FIG. 6D has a bottom portion formed by a V-shaped bottom surface 23a, and a side wall portion extending from the bottom surface 23a to the lower surface of the bulging portion 23b is formed such that the diameter and curvature of the rotating shaft 12 are substantially equal. It is formed by equal arc-shaped wall surfaces 23c.

By crimping the wall in the same manner as in the first embodiment, the V-shaped wall 20
At four points a, the groove 21 has five points on the bottom surface 21a and the side wall 21b and the lower surface of the bulging part 21d, and the groove 22 has three points on the bottom surface 21a and the arc-shaped wall surface 22a. The vibrator 1 is provided at four points, namely, a bottom surface 23a and an arc-shaped wall surface 23c.
0 can be firmly fixed to the rotating shaft 12.

It is to be noted that the present invention is not limited to the above-described one,
As shown in FIG. 7A, a U-shaped groove 24 whose bottom is formed in an arc shape substantially equal to the diameter of the rotating shaft 12 is provided.
A vibrator having a U-shaped groove portion 25 having a bottom surface and a side wall as shown in FIG. 7B and a groove portion 26 having a V-shaped wall surface as shown in FIG. Applicable.

(Second Embodiment) FIG. 8 shows a second embodiment of the present invention. The same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals. The description will be simplified. As shown in FIG. 8, in this vibration generating device, the end face of the tip end of the wall portion 14 in which the groove 13 is formed is located between the axial direction of the rotating shaft 12 and the end face 14 d on the motor side (not shown). The vibrator 10 is integrally coupled to the rotating shaft 12 by caulking the portion up to the other end surface 14e except for the portion 14c.

In the vibration generator having the above-described configuration, the same operation and effect as those of the first embodiment can be obtained. In particular, according to the vibration generator of the present embodiment, the vibration The crimped wall 14 bulges toward the end face 14d because the tip end face is crimped to the end face 14d, leaving a portion 14c between the end face 14d and the motor-side end face 14d. Thus, it is possible to prevent interference with a motor bearing or the like. For this reason, it is particularly suitable when applied to a small vibration generator in which the distance between the vibrator and the motor is small.

[0038]

As described above, according to the vibration generator for a small radio device according to any one of the first to fourth aspects, the vibrator is firmly rotated by the crimping force smaller than in the prior art. Since the vibrator can be fixed to the shaft, the vibrator can be reduced in size and weight, and the vibration generator and the small radio can be reduced in size and weight as a whole. In addition, the caulking load can be reduced and cracks in the vibrator can be reduced. As a result, the productivity of the vibration generator can be improved, and the vibration efficiency can be improved by increasing the specific gravity of the vibrator.

According to the second aspect of the present invention, the portion between the vibrator and the motor is generally secured by caulking the portion up to the other end surface while leaving the space between the vibrator and the motor. Even in a small vibration generating device having a small interval, it is possible to prevent the swaged wall portion from bulging and interfering with the motor, and according to the invention described in claim 4, After caulking, the plastic deformation of the wall provides an effect that the vibrator can be firmly fixed by more effectively closing the opening of the groove.

[Brief description of the drawings]

FIG. 1 is a front view showing a crimped state according to a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a perspective view showing the first embodiment.

FIG. 4 is a front view showing a shape of a vibrator according to another embodiment of the present invention.

FIG. 5 is a front view showing a shape of a vibrator according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing another shape of the groove in FIG. 1;

FIG. 7 is a longitudinal sectional view showing various shapes of a groove in another embodiment of the present invention.

FIG. 8 is a perspective view showing a second embodiment of the present invention.

FIG. 9 is a front view showing a crimped state in a conventional vibration generator.

FIG. 10 is a perspective view showing a conventional vibration generator crimped as shown in FIG.

[Explanation of symbols]

10, 16, 19 Vibrator 11, 17 Eccentric load portion 12 Rotary shaft of motor 13, 20, 21, 22, 24, 25, 26 Groove portion 14 Wall portion 14a Outer peripheral portion 14b Groove portion portion (caulked portion) 14d, 14e End face 15 Caulking punch W Width dimension of wall tip end face W ₁ Opening width of groove D Diameter of rotating shaft O Axis line

Claims (4)

[Claims] 1. A vibration generator for a small wireless device, wherein a vibrator is integrally connected to a rotating shaft of a motor, wherein the vibrator has a groove in which the rotating shaft fits into an eccentric load portion. Wall portions forming both side walls of the groove portion are formed to face each other, and a portion of the end portion of the wall portion on the side of the groove portion leaving an outer peripheral side portion, and an axial direction of the rotating shaft. A portion up to at least one end of the small radio is characterized in that the portion is swaged from the opening side to the bottom side of the groove to be integrated with the rotation shaft. Vibration generator. 2. An end surface of a front end portion of the wall portion is swaged in a portion extending to the other end surface in a direction of an axis of the rotation shaft, leaving a space between the end surface and the end surface on the motor side. The vibration generator for a small wireless device according to claim 1, wherein the vibration generator is integrally connected to a shaft. 3. A width W of the end face of the front end portion from the groove side to the outer peripheral side, which is 0.25 mm from the edge on the groove side.
The vibration generator for a small wireless device according to claim 1, wherein a range of W to 0.9 W is crimped. Groove wherein the transducer, together are formed in a size to internalize the central angle 180 ° or more ranges of the rotary shaft, the opening width W ₁ of the groove, the rotational shaft of the motor The ratio (W ₁ / D) to the diameter D is 0.50 to 0.50.
The vibration generator for a small wireless device according to any one of claims 1 to 3, wherein the vibration generator is set to be in a range of 0.95.